6750640 has 40 divisors (see below), whose sum is σ = 16905168. Its totient is φ = 2492160.

The previous prime is 6750637. The next prime is 6750647. The reversal of 6750640 is 460576.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6750640² = 91142280819200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6750599 and 6750608.

It is not an unprimeable number, because it can be changed into a prime (6750647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2206 + ... + 4285.

Almost surely, 2^6750640 is an apocalyptic number.

It is an amenable number.

6750640 is an abundant number, since it is smaller than the sum of its proper divisors (10154528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6750640 is a wasteful number, since it uses less digits than its factorization.

6750640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6517 (or 6511 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 6750640 is about 2598.1993764913. The cubic root of 6750640 is about 188.9941302545.

Subtracting from 6750640 its reverse (460576), we obtain a square (6290064 = 2508²).

The spelling of 6750640 in words is "six million, seven hundred fifty thousand, six hundred forty".